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          LV15-02-GPIO控制-02-应用开发实例
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<details class="folding-tag" blue><summary> 点击查看使用工具及版本 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center" rowspan="5">PC端开发环境</td>        <td align="center" width=150px>Windows</td>        <td align="left">Windows11</td>    </tr>    <tr>        <td align="center">Ubuntu</td>        <td align="left">Ubuntu20.04.6的64位版本（一开始使用的是16.04版本，后来进行了升级）</td>      </tr>    <tr>        <td align="center">VMware® Workstation 17 Pro</td>        <td align="left">17.0.0 build-20800274</td>      </tr>    <tr>        <td align="center">终端软件</td>        <td align="left">MobaXterm(Professional Edition v23.0 Build 5042 (license))</td>    </tr>    <tr>        <td align="center">Win32DiskImager</td>        <td align="left">Win32DiskImager v1.0</td>      </tr>    <tr>        <td align="center" rowspan="3">Linux开发板环境</td>        <td align="center">Linux开发板</td>        <td align="left">正点原子 i.MX6ULL Linux 阿尔法开发板</td>      </tr>    <tr>        <td align="center">uboot</td>        <td align="left">NXP官方提供的uboot，NXP提供的版本为uboot-imx-rel_imx_4.1.15_2.1.0_ga(使用的uboot版本为U-Boot 2016.03)</td>      </tr>    <tr>        <td align="center">linux内核</td>        <td align="left">linux-4.15(NXP官方提供)</td>      </tr></table>
              </div>
            </details>

<details class="folding-tag" blue><summary> 点击查看本文参考资料 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="5">官方网站</td>        <td align="left"><a href="https://www.arm.com/" target="_blank">https://www.arm.com/</a></td>        <td align="left">ARM官方网站，在这里我们可以找到Cotex-Mx以及ARMVx的一些文档</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/" target="_blank">https://www.nxp.com.cn/ </a></td>        <td align="left">NXP官方网站</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxpic.org.cn/" target="_blank">https://www.nxpic.org.cn/</a></td><td align="left">NXP 官方社区</td>    </tr>    <tr>        <td align="left"><a href="https://u-boot.readthedocs.io/en/latest/" target="_blank">https://u-boot.readthedocs.io/en/latest/</a></td><td align="left">u-boot官网</td>    </tr>    <tr>        <td align="left"><a href="https://www.kernel.org/" target="_blank">https://www.kernel.org/</a></td><td align="left">linux内核官网</td>    </tr></table>
              </div>
            </details>

<details class="folding-tag" blue><summary> 点击查看相关文件下载 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="4">NXP</td>        <td align="left"><a href="https://github.com/nxp-imx" target="_blank">https://github.com/nxp-imx</a></td>        <td align="left">NXP imx开发资源GitHub组织，里边会有u-boot和linux内核的仓库</td>    </tr>    <tr>        <td align="left"><a href="https://elixir.bootlin.com/linux/latest/source" target="_blank">https://elixir.bootlin.com/linux/latest/source</a></td>        <td align="left">在线阅读linux kernel源码</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/linux-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga" target="_blank">nxp-imx/linux-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga</a></td>        <td align="left">NXP linux内核仓库tags中的rel_imx_4.1.15_2.1.0_ga</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/uboot-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga" target="_blank">nxp-imx/uboot-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga</a></td>        <td align="left">NXP u-boot仓库tags中的rel_imx_4.1.15_2.1.0_ga</td>    </tr>    <tr>        <td align="center" rowspan="2">I.MX6ULL</td>        <td align="left"><a href="https://www.nxp.com.cn/docs/en/data-sheet/IMX6ULLIEC.pdf" target="_blank">i.MX 6ULL Applications Processors for Industrial Products</a></td>        <td align="left">I.MX6ULL 芯片手册（datasheet，可以在线查看）</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/webapp/Download?colCode=IMX6ULLRM&lang_cd=zh" target="_blank">i.MX 6ULL Applications ProcessorReference Manual</a></td>        <td align="left">I.MX6ULL 参考手册（下载后才能查看，需要登录NXP官网）</td>    </tr></table>
              </div>
            </details>

<p>这一部分的示例可以看这里：<a target="_blank" rel="noopener" href="https://gitee.com/sumumm/imx6ull-app-demo/tree/master/LV16_GPIO_CTRL">LV16_GPIO_CTRL · 苏木&#x2F;imx6ull-app-demo - 码云 - 开源中国 (gitee.com)</a></p>
<h1 id="一、GPIO——输出"><a href="#一、GPIO——输出" class="headerlink" title="一、GPIO——输出"></a><font size=3>一、GPIO——输出</font></h1><h2 id="1-代码编写"><a href="#1-代码编写" class="headerlink" title="1. 代码编写"></a><font size=3>1. 代码编写</font></h2><p>控制开发板上的某一个 GPIO 输出高、低不同的电平状态 的代码如下：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : gpio_out.c</span></span><br><span class="line"><span class="comment"> * Author     : 苏木</span></span><br><span class="line"><span class="comment"> * Date       : 2024-09-04</span></span><br><span class="line"><span class="comment"> * Version    :</span></span><br><span class="line"><span class="comment"> * Description:</span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdlib.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/types.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/stat.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;fcntl.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;unistd.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;string.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="type">static</span> <span class="type">char</span> gpio_out_path[<span class="number">100</span>];</span><br><span class="line"></span><br><span class="line"><span class="type">static</span> <span class="type">int</span> <span class="title function_">gpio_out_config</span><span class="params">(<span class="type">const</span> <span class="type">char</span> *attr, <span class="type">const</span> <span class="type">char</span> *val)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="type">int</span> len = <span class="number">0</span>;</span><br><span class="line">    <span class="type">int</span> fd = <span class="number">-1</span>;</span><br><span class="line">    <span class="type">char</span> file_path[<span class="number">100</span>] = &#123;<span class="number">0</span>&#125;;</span><br><span class="line"></span><br><span class="line">    <span class="built_in">sprintf</span>(file_path, <span class="string">&quot;%s/%s&quot;</span>, gpio_out_path, attr);</span><br><span class="line">    <span class="keyword">if</span> (<span class="number">0</span> &gt; (fd = open(file_path, O_WRONLY)))</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;open error&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> fd;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    len = <span class="built_in">strlen</span>(val);</span><br><span class="line">    <span class="keyword">if</span> (len != write(fd, val, len))</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;write error&quot;</span>);</span><br><span class="line">        close(fd);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    close(fd); <span class="comment">// 关闭文件</span></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">(<span class="type">int</span> argc, <span class="type">char</span> *argv[])</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 校验传参 */</span></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">3</span> != argc)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">fprintf</span>(<span class="built_in">stderr</span>, <span class="string">&quot;usage: %s &lt;gpio&gt; &lt;value&gt;\n&quot;</span>, argv[<span class="number">0</span>]);</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 判断指定编号的GPIO是否导出 */</span></span><br><span class="line">    <span class="built_in">sprintf</span>(gpio_out_path, <span class="string">&quot;/sys/class/gpio/gpio%s&quot;</span>, argv[<span class="number">1</span>]);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (access(gpio_out_path, F_OK))</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="comment">// 如果目录不存在 则需要导出</span></span><br><span class="line">        <span class="type">int</span> fd = <span class="number">-1</span>;</span><br><span class="line">        <span class="type">int</span> len = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (<span class="number">0</span> &gt; (fd = open(<span class="string">&quot;/sys/class/gpio/export&quot;</span>, O_WRONLY)))</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;open error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        len = <span class="built_in">strlen</span>(argv[<span class="number">1</span>]);</span><br><span class="line">        <span class="keyword">if</span> (len != write(fd, argv[<span class="number">1</span>], len))</span><br><span class="line">        &#123; </span><br><span class="line">            <span class="comment">// 导出gpio</span></span><br><span class="line">            perror(<span class="string">&quot;write error&quot;</span>);</span><br><span class="line">            close(fd);</span><br><span class="line">            <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        close(fd); <span class="comment">// 关闭文件</span></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 配置为输出模式 */</span></span><br><span class="line">    <span class="keyword">if</span> (gpio_out_config(<span class="string">&quot;direction&quot;</span>, <span class="string">&quot;out&quot;</span>))</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">/* 极性设置 */</span></span><br><span class="line">    <span class="keyword">if</span> (gpio_out_config(<span class="string">&quot;active_low&quot;</span>, <span class="string">&quot;0&quot;</span>))</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 控制GPIO输出高低电平 */</span></span><br><span class="line">    <span class="keyword">if</span> (gpio_out_config(<span class="string">&quot;value&quot;</span>, argv[<span class="number">2</span>]))</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 退出程序 */</span></span><br><span class="line">    <span class="built_in">exit</span>(<span class="number">0</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>执行程序时需要传入两个参数， argv[1]指定 GPIO 的编号、 argv[2]指定输出电平状态（0 表示低电平、1 表示高电平）。  </p>
<p>上述代码中首先使用 access()函数判断指定编号的 GPIO 引脚是否已经导出，也就是判断相应的 gpioX目录是否存在，如果不存在则表示未导出，则通过”&#x2F;sys&#x2F;class&#x2F;gpio&#x2F;export”文件将其导出；导出之后先配置了GPIO 引脚为输出模式，也就是向 direction 文件中写入”out”；接着再配置极性，通过向 active_low 文件中写入”0”（不用配置也可以） ；最后再控制 GPIO 引脚输出相应的电平状态，通过对 value 属性文件写入”1”或<br>“0”来使其输出高电平或低电平。  </p>
<h2 id="2-开发板测试"><a href="#2-开发板测试" class="headerlink" title="2. 开发板测试"></a><font size=3>2. 开发板测试</font></h2><p>在测试之前，选择一个测试引脚，这里以板子上的 GPIO1_IO01 引脚为例，该引脚在底板上已经引出，如下所示：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV15-02-GPIO%E6%8E%A7%E5%88%B6-02-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91%E5%AE%9E%E4%BE%8B/img/image-20240905073307815.png" alt="image-20240905073307815" style="zoom:50%;" />

<p>执行该应用程序控制开发板上的 GPIO1_IO01 引脚输出高或低电平：  </p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">./app_demo 1 1 #控制 GPIO1_IO01 输出高电平</span><br><span class="line">./app_demo 1 0 #控制 GPIO1_IO01 输出低电平</span><br></pre></td></tr></table></figure>

<p>执行相应的命令后，可以使用万用表或者连接一个 LED 小灯进行检验，以验证实验结果！  </p>
<h1 id="二、GPIO——输入"><a href="#二、GPIO——输入" class="headerlink" title="二、GPIO——输入"></a><font size=3>二、GPIO——输入</font></h1><h2 id="1-代码编写-1"><a href="#1-代码编写-1" class="headerlink" title="1. 代码编写"></a><font size=3>1. 代码编写</font></h2><p>某引脚配置为输入，读取电平状态的代码如下：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : gpio_in.c</span></span><br><span class="line"><span class="comment"> * Author     : 苏木</span></span><br><span class="line"><span class="comment"> * Date       : 2024-09-04</span></span><br><span class="line"><span class="comment"> * Version    :</span></span><br><span class="line"><span class="comment"> * Description:</span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdlib.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/types.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/stat.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;fcntl.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;unistd.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;string.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="type">static</span> <span class="type">char</span> gpio_in_path[<span class="number">100</span>];</span><br><span class="line"></span><br><span class="line"><span class="type">static</span> <span class="type">int</span> <span class="title function_">gpio_in_config</span><span class="params">(<span class="type">const</span> <span class="type">char</span> *attr, <span class="type">const</span> <span class="type">char</span> *val)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="type">int</span> len = <span class="number">0</span>;</span><br><span class="line">    <span class="type">int</span> fd = <span class="number">-1</span>;</span><br><span class="line">    <span class="type">char</span> file_path[<span class="number">100</span>] = &#123;<span class="number">0</span>&#125;;</span><br><span class="line"></span><br><span class="line">    <span class="built_in">sprintf</span>(file_path, <span class="string">&quot;%s/%s&quot;</span>, gpio_in_path, attr);</span><br><span class="line">    <span class="keyword">if</span> (<span class="number">0</span> &gt; (fd = open(file_path, O_WRONLY)))</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;open error&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> fd;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    len = <span class="built_in">strlen</span>(val);</span><br><span class="line">    <span class="keyword">if</span> (len != write(fd, val, len))</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;write error&quot;</span>);</span><br><span class="line">        close(fd);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    close(fd); <span class="comment">// 关闭文件</span></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">(<span class="type">int</span> argc, <span class="type">char</span> *argv[])</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="type">char</span> val = <span class="number">0</span>;</span><br><span class="line">    <span class="type">int</span> fd = <span class="number">-1</span>;</span><br><span class="line">    <span class="type">char</span> file_path[<span class="number">100</span>] = &#123;<span class="number">0</span>&#125;;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 校验传参 */</span></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">2</span> != argc)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">fprintf</span>(<span class="built_in">stderr</span>, <span class="string">&quot;usage: %s &lt;gpio&gt;\n&quot;</span>, argv[<span class="number">0</span>]);</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 判断指定编号的GPIO是否导出 */</span></span><br><span class="line">    <span class="built_in">sprintf</span>(gpio_in_path, <span class="string">&quot;/sys/class/gpio/gpio%s&quot;</span>, argv[<span class="number">1</span>]);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (access(gpio_in_path, F_OK))</span><br><span class="line">    &#123; </span><br><span class="line">        <span class="comment">// 如果目录不存在 则需要导出</span></span><br><span class="line">        <span class="type">int</span> len = <span class="number">0</span>;</span><br><span class="line">        <span class="keyword">if</span> (<span class="number">0</span> &gt; (fd = open(<span class="string">&quot;/sys/class/gpio/export&quot;</span>, O_WRONLY)))</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;open error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        len = <span class="built_in">strlen</span>(argv[<span class="number">1</span>]);</span><br><span class="line">        <span class="keyword">if</span> (len != write(fd, argv[<span class="number">1</span>], len))</span><br><span class="line">        &#123; <span class="comment">// 导出gpio</span></span><br><span class="line">            perror(<span class="string">&quot;write error&quot;</span>);</span><br><span class="line">            close(fd);</span><br><span class="line">            <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        close(fd); <span class="comment">// 关闭文件</span></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 配置为输入模式 */</span></span><br><span class="line">    <span class="keyword">if</span> (gpio_in_config(<span class="string">&quot;direction&quot;</span>, <span class="string">&quot;in&quot;</span>))</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 极性设置 */</span></span><br><span class="line">    <span class="keyword">if</span> (gpio_in_config(<span class="string">&quot;active_low&quot;</span>, <span class="string">&quot;0&quot;</span>))</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 配置为非中断方式 */</span></span><br><span class="line">    <span class="keyword">if</span> (gpio_in_config(<span class="string">&quot;edge&quot;</span>, <span class="string">&quot;none&quot;</span>))</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 读取GPIO电平状态 */</span></span><br><span class="line">    <span class="built_in">sprintf</span>(file_path, <span class="string">&quot;%s/%s&quot;</span>, gpio_in_path, <span class="string">&quot;value&quot;</span>);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">0</span> &gt; (fd = open(file_path, O_RDONLY)))</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;open error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">0</span> &gt; read(fd, &amp;val, <span class="number">1</span>))</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;read error&quot;</span>);</span><br><span class="line">        close(fd);</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">&quot;value: %c\n&quot;</span>, val);</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 退出程序 */</span></span><br><span class="line">    close(fd);</span><br><span class="line">    <span class="built_in">exit</span>(<span class="number">0</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>执行程序时需要传入一个参数， argv[1]指定要读取电平状态的 GPIO 对应的编号。上述代码中首先使用 access()函数判断指定编号的 GPIO 引脚是否已经导出， 若未导出， 则通过”&#x2F;sys&#x2F;class&#x2F;gpio&#x2F;export”文件将其导出；导出之后先配置了 GPIO 引脚为输入模式，也就是向 direction 文件中写入”in”；接着再配置极性、设置 GPIO 引脚为非中断模式（向 edge 属性文件中写入”none”）。最后打开 value 属性文件，读取 GPIO 的电平状态并将其打印出来。  </p>
<h2 id="2-开发板测试-1"><a href="#2-开发板测试-1" class="headerlink" title="2. 开发板测试"></a><font size=3>2. 开发板测试</font></h2><p>在测试之前，选择一个测试引脚，这里以板子上的 GPIO1_IO01 引脚为例，该引脚在底板上已经引出，如下所示：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV15-02-GPIO%E6%8E%A7%E5%88%B6-02-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91%E5%AE%9E%E4%BE%8B/img/image-20240905073307815.png" alt="image-20240905073307815" style="zoom:50%;" />

<p>首先通过杜邦线将 GPIO1_IO01 引脚连接到板子上的 3.3V 电源引脚上，接着执行命令读取 GPIO 电平状态。命令如下：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">./app_demo 1</span><br></pre></td></tr></table></figure>

<p>应该会看到打印出的 value 等于 1，表示读取到 GPIO 的电平确实是高电平；接着将 GPIO1_IO01 引脚连接到板子上的 GND 引脚上，执行命令：  </p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">./app_demo 1</span><br></pre></td></tr></table></figure>

<p>应该会看到打印出的 value 等于 0，表示读取到 GPIO 的电平确实是低电平。</p>
<h1 id="三、GPIO——中断"><a href="#三、GPIO——中断" class="headerlink" title="三、GPIO——中断"></a><font size=3>三、GPIO——中断</font></h1><h2 id="1-代码编写-2"><a href="#1-代码编写-2" class="headerlink" title="1. 代码编写"></a><font size=3>1. 代码编写</font></h2><p>在应用层可以将 GPIO 配置为中断触发模式，例如将 GPIO 配置为上升沿触发、下降沿触发或者边沿触发  。将 GPIO 配置为边沿触发模式并监测中断触发状态的示例代码如下：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br><span class="line">151</span><br><span class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : gpio_out.c</span></span><br><span class="line"><span class="comment"> * Author     : 苏木</span></span><br><span class="line"><span class="comment"> * Date       : 2024-09-04</span></span><br><span class="line"><span class="comment"> * Version    :</span></span><br><span class="line"><span class="comment"> * Description:</span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdlib.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/types.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/stat.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;fcntl.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;unistd.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;string.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;poll.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="type">static</span> <span class="type">char</span> gpio_intr_path[<span class="number">100</span>];</span><br><span class="line"></span><br><span class="line"><span class="type">static</span> <span class="type">int</span> <span class="title function_">gpio_intr_config</span><span class="params">(<span class="type">const</span> <span class="type">char</span> *attr, <span class="type">const</span> <span class="type">char</span> *val)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="type">int</span> len = <span class="number">0</span>;</span><br><span class="line">    <span class="type">int</span> fd = <span class="number">-1</span>;</span><br><span class="line">    <span class="type">char</span> file_path[<span class="number">100</span>] = &#123;<span class="number">0</span>&#125;;</span><br><span class="line"></span><br><span class="line">    <span class="built_in">sprintf</span>(file_path, <span class="string">&quot;%s/%s&quot;</span>, gpio_intr_path, attr);</span><br><span class="line">    <span class="keyword">if</span> (<span class="number">0</span> &gt; (fd = open(file_path, O_WRONLY)))</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;open error&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> fd;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    len = <span class="built_in">strlen</span>(val);</span><br><span class="line">    <span class="keyword">if</span> (len != write(fd, val, len))</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;write error&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    close(fd); <span class="comment">// 关闭文件</span></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">(<span class="type">int</span> argc, <span class="type">char</span> *argv[])</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="type">int</span> ret = <span class="number">0</span>;</span><br><span class="line">    <span class="type">char</span> val = <span class="number">0</span>;</span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">pollfd</span> <span class="title">pfd</span> =</span> &#123;<span class="number">0</span>&#125;;</span><br><span class="line">    <span class="type">char</span> file_path[<span class="number">100</span>] = &#123;<span class="number">0</span>&#125;;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 校验传参 */</span></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">2</span> != argc)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">fprintf</span>(<span class="built_in">stderr</span>, <span class="string">&quot;usage: %s &lt;gpio&gt;\n&quot;</span>, argv[<span class="number">0</span>]);</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 判断指定编号的GPIO是否导出 */</span></span><br><span class="line">    <span class="built_in">sprintf</span>(gpio_intr_path, <span class="string">&quot;/sys/class/gpio/gpio%s&quot;</span>, argv[<span class="number">1</span>]);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (access(gpio_intr_path, F_OK))</span><br><span class="line">    &#123;</span><br><span class="line">         <span class="comment">// 如果目录不存在 则需要导出</span></span><br><span class="line">        <span class="type">int</span> len = <span class="number">0</span>;</span><br><span class="line">        <span class="type">int</span> fd = <span class="number">-1</span>;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (<span class="number">0</span> &gt; (fd = open(<span class="string">&quot;/sys/class/gpio/export&quot;</span>, O_WRONLY)))</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;open error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        len = <span class="built_in">strlen</span>(argv[<span class="number">1</span>]);</span><br><span class="line">        <span class="keyword">if</span> (len != write(fd, argv[<span class="number">1</span>], len))</span><br><span class="line">        &#123; </span><br><span class="line">            <span class="comment">// 导出gpio</span></span><br><span class="line">            perror(<span class="string">&quot;write error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        close(fd); <span class="comment">// 关闭文件</span></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 配置为输入模式 */</span></span><br><span class="line">    <span class="keyword">if</span> (gpio_intr_config(<span class="string">&quot;direction&quot;</span>, <span class="string">&quot;in&quot;</span>))</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 极性设置 */</span></span><br><span class="line">    <span class="keyword">if</span> (gpio_intr_config(<span class="string">&quot;active_low&quot;</span>, <span class="string">&quot;0&quot;</span>))</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 配置中断触发方式: 上升沿和下降沿 */</span></span><br><span class="line">    <span class="keyword">if</span> (gpio_intr_config(<span class="string">&quot;edge&quot;</span>, <span class="string">&quot;both&quot;</span>))</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 打开value属性文件 */</span></span><br><span class="line">    <span class="built_in">sprintf</span>(file_path, <span class="string">&quot;%s/%s&quot;</span>, gpio_intr_path, <span class="string">&quot;value&quot;</span>);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">0</span> &gt; (pfd.fd = open(file_path, O_RDONLY)))</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;open error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 调用poll */</span></span><br><span class="line">    pfd.events = POLLPRI; <span class="comment">// 只关心高优先级数据可读（中断）</span></span><br><span class="line"></span><br><span class="line">    read(pfd.fd, &amp;val, <span class="number">1</span>); <span class="comment">// 先读取一次清除状态</span></span><br><span class="line">    <span class="keyword">for</span> (;;)</span><br><span class="line">    &#123;</span><br><span class="line"></span><br><span class="line">        ret = poll(&amp;pfd, <span class="number">1</span>, <span class="number">-1</span>); <span class="comment">// 调用poll</span></span><br><span class="line">        <span class="keyword">if</span> (<span class="number">0</span> &gt; ret)</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;poll error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">else</span> <span class="keyword">if</span> (<span class="number">0</span> == ret)</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="built_in">fprintf</span>(<span class="built_in">stderr</span>, <span class="string">&quot;poll timeout.\n&quot;</span>);</span><br><span class="line">            <span class="keyword">continue</span>;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">/* 校验高优先级数据是否可读 */</span></span><br><span class="line">        <span class="keyword">if</span> (pfd.revents &amp; POLLPRI)</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">if</span> (<span class="number">0</span> &gt; lseek(pfd.fd, <span class="number">0</span>, SEEK_SET))</span><br><span class="line">            &#123; </span><br><span class="line">                <span class="comment">// 将读位置移动到头部</span></span><br><span class="line">                perror(<span class="string">&quot;lseek error&quot;</span>);</span><br><span class="line">                <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            <span class="keyword">if</span> (<span class="number">0</span> &gt; read(pfd.fd, &amp;val, <span class="number">1</span>))</span><br><span class="line">            &#123;</span><br><span class="line">                perror(<span class="string">&quot;read error&quot;</span>);</span><br><span class="line">                <span class="built_in">exit</span>(<span class="number">-1</span>);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            <span class="built_in">printf</span>(<span class="string">&quot;GPIO中断触发&lt;value=%c&gt;\n&quot;</span>, val);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 退出程序 */</span></span><br><span class="line">    <span class="built_in">exit</span>(<span class="number">0</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h2 id="2-开发板测试-2"><a href="#2-开发板测试-2" class="headerlink" title="2. 开发板测试"></a><font size=3>2. 开发板测试</font></h2><p>在测试之前，选择一个测试引脚，这里以板子上的 GPIO1_IO02 （图中红框下面的引脚）引脚为例，该引脚在底板上已经引出，如下所示：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV15-02-GPIO%E6%8E%A7%E5%88%B6-02-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91%E5%AE%9E%E4%BE%8B/img/image-20240905073307815.png" alt="image-20240905073307815" style="zoom:50%;" />

<p>执行应用程序监测 GPIO1_IO02 引脚的中断触发情况，如下所示  ：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">./app_demo 2 # 监测 GPIO1_IO02 引脚中断触发</span><br></pre></td></tr></table></figure>

<p>当执行命令之后，我们可以使用杜邦线将 GPIO1_IO02 引脚连接到 GND 或 3.3V 电源引脚上，来回切换，使得 GPIO1_IO02 引脚的电平状态发生由高到低或由低到高的状态变化， 以验证 GPIO 中断的边沿触发情况；当发生中断时，终端将会打印相应的信息，如上图所示。  </p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV15-02-GPIO%E6%8E%A7%E5%88%B6-02-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91%E5%AE%9E%E4%BE%8B/img/image-20240905074717197.png" alt="image-20240905074717197" style="zoom:50%;" />

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    <p><span>文章标题:</span><a href="/post/39ed1ef6.html">LV15-02-GPIO控制-02-应用开发实例</a></p>
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